FIRST DOWN. All progress in a football game is measured in yards. The offensive team tries to get as much yardage as it can to try and move closer to the opponent's end zone. Each time the offense gets the ball, it has four downs, or chances, in which to gain 10 yards.
The largest eagle species in the world is the Pithecophaga jefferyi or Philippine eagle. This species of eagle is on the critically endangered list due to the rapid decline in habitat, which is the tropical rainforest. Keep Learning.
1. The Harpy Eagle (Harpia harpyja) is one of the biggest of all eagles. Measuring around 37 inches (88cm) in height and weighing up to 18lbs (8kg) for females, and up to 16lbs (7kg) for males, harpy eagles have powerful talons that grow to about 5 inches (12cm) in length.. The Harpy Eagle (Harpia harpyja) is one of the biggest of all eagles. Measuring around 37 inches (88cm) in height and weighing up to 18lbs (8kg) for females, and up to 16lbs (7kg) for males, harpy eagles have powerful talons that grow to about 5 inches (12cm) in length.